In a manner lacking feeling, emotion, or sensitivity; coldly or indifferently.
From 'feelingless' (feeling + -less) + '-ly' (adverbial suffix). This multi-layered construction demonstrates English's recursive ability to add suffixes.
Adding '-ly' to an already negative adjective ('feelingless') creates an intensified coldness—it's the linguistic equivalent of being doubly removed from warmth or connection.
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